简便运算,越简便越好9+19+29+39+49+59+69+79+89+99
人气：354 ℃ 时间：2019-08-21 22:41:47
解答
你可以发现9＋99＝19＋89＝……＝49＋59＝108
所以原式＝9+19+29+39+49+59+69+79+89+99
＝108×5
＝540
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